Adobe photoshop cs2 Manual De Usuario
641
ADOBE PHOTOSHOP CS2
User Guide
To shift colors to the closest web palette equivalent
To protect colors from dithering in a browser, you can shift the colors to their closest equivalents in the web palette.
This ensures that the colors won’t dither when displayed in browsers on either Windows or Macintosh operating
systems capable of displaying only 256 colors.
This ensures that the colors won’t dither when displayed in browsers on either Windows or Macintosh operating
systems capable of displaying only 256 colors.
1
Select one or more colors in the optimized image or color table.
2
Do one of the following:
•
Click the Web Shift button
in the Color Table palette.
•
Choose Shift Selected Colors to Web Palette from the Color Table palette menu.The original color appears at the
upper left of the color swatch and the new color at the lower right. The small white diamond
upper left of the color swatch and the new color at the lower right. The small white diamond
in the center of
the color swatch indicates that the color is web-safe; the small square at the lower right of the color swatch indicates
that the color is locked.
that the color is locked.
3
To set a tolerance for shifting, enter a value for Web Snap or drag the pop-up slider. A higher value shifts more
colors.
To revert web-shifted colors to their original colors
Do one of the following:
•
Select a web-shifted color in the color table and click the Web Shift button
in the Color Table palette.
•
To revert all web-shifted colors in the color table, choose Unshift All Web Shifted Colors from the Color Table
palette menu.
palette menu.
To map colors to transparency
You can add transparency to an optimized image by mapping existing colors to transparency.
1
Select one or more colors in the optimized image or color table.
2
Do one of the following:
•
Click the Map Transparency button
in the Color Table palette.
•
Choose Map Selected Colors To Transparent from the Color Table palette menu.
The transparency grid
appears in half of each mapped color. The small square at the lower right of the color
swatch indicates that the color is locked.
To revert transparency to its original colors
Do one of the following:
•
Select the colors you want to revert and click the Map Transparency button
or choose Unmap Selected Colors
from Transparent from the Color Table palette menu.
•
To revert all transparency-mapped colors, choose Unmap All Transparent Colors.
To lock a color
You can lock selected colors in the color table to prevent them from being dropped when the number of colors is
reduced and to prevent them from dithering in the application.
reduced and to prevent them from dithering in the application.